A 9.75 L 9.75 L container holds a mixture of two gases at 41 ° C. 41 °C. The partial pressures of gas A and gas B, respectively, are 0.419 atm 0.419 atm and 0.589 atm. 0.589 atm. If 0.240 mol 0.240 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

The total  pressure P = 1.642 atm

Explanation:

From the dalton's law

Total pressure of the mixture is

----- (1)

atm

atm

n = 0.24 mole

R =

T = 41 °c = 314 K

= 0.634 atm

From equation (1)

P = 0.419 + 0.589 + 0.634

P = 1.642 atm

Thus the total  pressure P = 1.642 atm

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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